Spontaneity conditions: A reaction is always spontaneous when ΔH < 0 and ΔS > 0; never spontaneous when ΔH > 0 and ΔS < 0; temperature-dependent otherwise.
How to apply it: Apply the four ΔH/ΔS sign combinations to predict spontaneity at different temperatures.
Course: AP Chemistry · Unit: Applications of Thermodynamics
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